108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
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package main
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import (
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"fmt"
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"io"
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"log"
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"net"
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"time"
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"github.com/emersion/go-smtp"
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)
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// The backend structure is called for authentication of a new session.
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type SMTPBackend struct {
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smtp.Backend
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}
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// During the process of receiving an email, this session is called.
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type SMTPSession struct {
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smtp.Session
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remoteAddr net.Addr
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from string
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to string
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}
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// On login, we do not care about authentication. So we just start a new session and provide it ;)
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func (b *SMTPBackend) Login(state *smtp.ConnectionState, username, password string) (smtp.Session, error) {
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return &SMTPSession{
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remoteAddr: state.RemoteAddr,
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}, nil
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}
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// We want to receive all emails, including anonymous emails.
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func (b *SMTPBackend) AnonymousLogin(state *smtp.ConnectionState) (smtp.Session, error) {
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return &SMTPSession{
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remoteAddr: state.RemoteAddr,
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}, nil //return nil, smtp.ErrAuthRequired
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}
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// The session has provided mail options and who the message is from.
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func (s *SMTPSession) Mail(from string, opts smtp.MailOptions) error {
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// Store the from in the session for when we receive the final message data.
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s.from = from
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return nil
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}
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// The session has provided who the mail is to.
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func (s *SMTPSession) Rcpt(to string) error {
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// Store who the mail is to for final message data.
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s.to = to
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return nil
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}
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// The session has provided the data for the message.
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func (s *SMTPSession) Data(r io.Reader) error {
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// Save the message to the database.
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err := MailSaveMessage(s.remoteAddr.String(), s.from, s.to, r)
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if err != nil {
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log.Println("Unable to parse email:", err)
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}
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return nil
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}
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// When the SMTP session is requested to start over.
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func (s *SMTPSession) Reset() {}
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// When the session is done completely.
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func (s *SMTPSession) Logout() error {
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return nil
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}
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// This function starts the SMTP server.
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func SMTPServe() {
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// Get the configuration.
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smtpBindAddr := app.config.SMTPBindAddr
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smtpPort := app.config.SMTPPort
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smtpDomain := app.config.SMTPDomain
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if app.context.String("smtp-bind") != "" {
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smtpBindAddr = app.context.String("smtp-bind")
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}
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if app.context.Uint("smtp-port") != 0 {
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smtpPort = app.context.Uint("smtp-port")
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}
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if app.context.String("smtp-domain") != "" {
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smtpDomain = app.context.String("smtp-domain")
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}
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// Create the SMTP server with our custom backend.
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smtpBackend := &SMTPBackend{}
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smtpServer := smtp.NewServer(smtpBackend)
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app.smtpServer = smtpServer
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// Configure the SMTP server.
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smtpServer.Addr = fmt.Sprintf("%s:%d", smtpBindAddr, smtpPort)
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smtpServer.Domain = smtpDomain
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smtpServer.ReadTimeout = 10 * time.Second
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smtpServer.WriteTimeout = 10 * time.Second
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smtpServer.MaxMessageBytes = app.config.MaxMessageSize
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smtpServer.MaxRecipients = 50
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smtpServer.AllowInsecureAuth = true
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// Start the server.
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log.Println("Starting smtp server on port", smtpPort)
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if err := smtpServer.ListenAndServe(); err != nil {
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log.Fatal(err)
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}
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}
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